Visual Studio does this automatically. Just position the cursor directly above the method and enter three '/'s
for example:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace MvcWidgets.Models
{
/// <summary>
/// This is a summary comment
/// </summary>
public class Comment
{
/// <summary>
///
/// </summary>
/// <param name="name"></param>
/// <param name="birthdate"></param>
/// <param name="website"></param>
/// <returns></returns>
public int SomeMethod(string name, DateTime birthdate, Uri website)
{
return 0;
}
}
}
You can then generate an XML comment file and then generate a Help file using SandCastle.
You may have to enable this feature in the Text Editor/C#/Advanced options dialog.